package com.publishsystem.util;

import com.google.zxing.BarcodeFormat;
import com.google.zxing.EncodeHintType;
import com.google.zxing.MultiFormatWriter;
import com.google.zxing.WriterException;
import com.google.zxing.common.BitMatrix;

import javax.imageio.ImageIO;
import java.awt.image.BufferedImage;
import java.io.File;
import java.io.IOException;
import java.io.OutputStream;
import java.util.Hashtable;

public class QRUtil {

    private static final int BLACK = 0xFF000000;
    private static final int WHITE = 0xFFFFFFFF;

    private QRUtil() {
    }

    public static BufferedImage toBufferedImage(BitMatrix matrix) {
        int width = matrix.getWidth();
        int height = matrix.getHeight();
        BufferedImage image = new BufferedImage(width, height,
                BufferedImage.TYPE_INT_RGB);
        for (int x = 0; x < width; x++) {
            for (int y = 0; y < height; y++) {
                image.setRGB(x, y, matrix.get(x, y) ? BLACK : WHITE);
            }
        }
        return image;
    }

    public static void writeToFile(BitMatrix matrix, String format, File file)
            throws IOException {
        BufferedImage image = toBufferedImage(matrix);
        if (!ImageIO.write(image, format, file)) {
            throw new IOException("Could not write an image of format "
                    + format + " to " + file);
        }
    }

    public static void writeToStream(BitMatrix matrix, String format,
                                     OutputStream stream) throws IOException {
        BufferedImage image = toBufferedImage(matrix);
        if (!ImageIO.write(image, format, stream)) {
            throw new IOException("Could not write an image of format "
                    + format);
        }
    }

    /**
     * @param content二维码内容
     * @param qrFormat二维码图片格式
     * @param width
     * @param height
     * @param savePath
     */
    @SuppressWarnings({"unchecked", "rawtypes"})
    public static void createQrCode(String content, String qrFormat, int width,
                                    int height, String savePath) {
        Hashtable hints = new Hashtable();
        // 设置字符集
        hints.put(EncodeHintType.CHARACTER_SET, "utf-8");
        BitMatrix bitMatrix;
        try {
            bitMatrix = new MultiFormatWriter().encode(content,
                    BarcodeFormat.QR_CODE, width, height, hints);
            // File outputFile = new File("d:"+File.separator+"new1.jpg");
            File outputFile = new File(savePath);
            try {
                QRUtil.writeToFile(bitMatrix, qrFormat, outputFile);
            } catch (IOException e) {
                e.printStackTrace();
            }
        } catch (WriterException e) {
            e.printStackTrace();
        }

    }
}
